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| author | Mike Snitzer <snitzer@redhat.com> | 2015-06-26 17:01:13 +0300 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2015-06-26 17:11:58 +0300 |
| commit | 78d8e58a086b214dddf1fd463e20a7e1d82d7866 (patch) | |
| tree | 2868b9a09eb82b8ecf37ec96fc494838dfdee63a /lib/usercopy.c | |
| parent | 4e6e36c3714364b65f2bfea8c73691c663891726 (diff) | |
| download | linux-78d8e58a086b214dddf1fd463e20a7e1d82d7866.tar.xz | |
Revert "block, dm: don't copy bios for request clones"
This reverts commit 5f1b670d0bef508a5554d92525f5f6d00d640b38.
Justification for revert as reported in this dm-devel post:
https://www.redhat.com/archives/dm-devel/2015-June/msg00160.html
this change should not be pushed to mainline yet.
Firstly, Christoph has a newer version of the patch that fixes silent
data corruption problem:
https://www.redhat.com/archives/dm-devel/2015-May/msg00229.html
And the new version still depends on LLDDs to always complete requests
to the end when error happens, while block API doesn't enforce such a
requirement. If the assumption is ever broken, the inconsistency between
request and bio (e.g. rq->__sector and rq->bio) will cause silent data
corruption:
https://www.redhat.com/archives/dm-devel/2015-June/msg00022.html
Reported-by: Junichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'lib/usercopy.c')
0 files changed, 0 insertions, 0 deletions